Changeset 93253 in vbox

Timestamp:

Jan 16, 2022 2:27:00 AM (3 years ago)

Author:

vboxsync

Message:

IPRT/zero.asm: Try save 64KB file space on windows.

File:

trunk/src/VBox/Runtime/common/misc/zero.asm

-              r93115
+              r93253
 %include "iprt/asmdefs.mac"
+; Putting it in the code segment/section for now.
+;
+; Section to put this in.
+;
+;       - PE/COFF: Unless we put this in an BSS like section, the linker will
+;         write out 64KB of zeros.  (Tried using .rdata$zz and put it at the end
+;         of that section, but the linker did not reduce the RawDataSize.)  The
+;         assmebler does not let us control the write flag directly, so we emit
+;         a linker directive that switches of the write flag for the section.
+;
+;       - Fallback: Code section.
+;
+%ifdef ASM_FORMAT_PE
+section .drectve info
+        db '-section:.zero,!W '
+section .zero bss align=4096
+%else
 BEGINCODE
+%endif
 ;;
 …
 EXPORTEDNAME_EX g_abRTZero32K, object
 EXPORTEDNAME_EX g_abRTZero64K, object
+%ifdef ASM_FORMAT_PE
+        resb  0x10000
+%else
         times 0x10000/(16*4) dd 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0
+%endif
 %ifdef ASM_FORMAT_ELF
 size g_abRTZeroPage     _4K
 …
 size g_abRTZero64K     _64K
 %endif

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